diff --git a/sksurgeryimage/calibration/charuco.py b/sksurgeryimage/calibration/charuco.py
index 6b96978..92dc2f9 100644
--- a/sksurgeryimage/calibration/charuco.py
+++ b/sksurgeryimage/calibration/charuco.py
@@ -236,12 +236,16 @@ def make_charuco_with_chessboard(
          charuco_squares[1] * charuco_pixels_per_square)
     )
 
-    centre_of_image = (((charuco_squares[0] * charuco_pixels_per_square) - 1) / 2.0,
-                       ((charuco_squares[1] * charuco_pixels_per_square) - 1) / 2.0)
+    centre_of_image = (
+        ((charuco_squares[0] * charuco_pixels_per_square) - 1) / 2.0,
+        ((charuco_squares[1] * charuco_pixels_per_square) - 1) / 2.0
+    )
 
     # Creates minimum size chessboard, one pixel per chessboard square.
     chessboard_image = np.zeros((chessboard_squares[1],
                                  chessboard_squares[0]), dtype=np.uint8)
+
+    # pylint: disable=invalid-name
     for x in range(0, chessboard_squares[0]):
         for y in range(0, chessboard_squares[1]):
             if x % 2 == 0 and y % 2 == 0 or x % 2 == 1 and y % 2 == 1:
@@ -257,8 +261,10 @@ def make_charuco_with_chessboard(
 
     # Draw white polygon around chessboard
     corners = np.zeros((4, 2))
-    corner_offsets = (((chessboard_squares[0] / 2) + chessboard_border) * chessboard_scale,
-                      ((chessboard_squares[1] / 2) + chessboard_border) * chessboard_scale)
+    corner_offsets = (
+        ((chessboard_squares[0] / 2) + chessboard_border) * chessboard_scale,
+        ((chessboard_squares[1] / 2) + chessboard_border) * chessboard_scale
+    )
     corners[0][0] = int(centre_of_image[0] - corner_offsets[0])
     corners[0][1] = int(centre_of_image[1] - corner_offsets[1])
     corners[1][0] = int(centre_of_image[0] + corner_offsets[0])
diff --git a/sksurgeryimage/calibration/point_detector_utils.py b/sksurgeryimage/calibration/point_detector_utils.py
index 124e113..b433966 100644
--- a/sksurgeryimage/calibration/point_detector_utils.py
+++ b/sksurgeryimage/calibration/point_detector_utils.py
@@ -14,10 +14,17 @@ def write_annotated_image(input_image, ids, image_points, image_file_name):
     image = copy.deepcopy(input_image)
     font = cv2.FONT_HERSHEY_SIMPLEX
     for counter in range(ids.shape[0]):
-        cv2.putText(image, str(ids[counter][0]), (int(image_points[counter][0]), int(image_points[counter][1])), font, 0.5, (0, 255, 0), 2, cv2.LINE_AA)
+        cv2.putText(image,
+                    str(ids[counter][0]),
+                    (int(image_points[counter][0]),
+                     int(image_points[counter][1])),
+                    font, 0.5, (0, 255, 0), 2, cv2.LINE_AA)
     split_path = os.path.splitext(image_file_name)
     previous_dir = os.path.dirname(split_path[0])
     previous_dir = os.path.basename(previous_dir)
     base_name = os.path.basename(split_path[0])
-    output_file = os.path.join('tests/output', base_name + '_' + previous_dir + '_labelled.png')
+    output_file = os.path.join('tests/output', base_name
+                               + '_'
+                               + previous_dir
+                               + '_labelled.png')
     cv2.imwrite(output_file, image)